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D. T. PORTER. CONTINUOUS BLAST APPARATUS.

No. 280,079. Patented June 26, 1883.

WITNESSES.

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UNITED STATES PATENT Diaries,

DAVID T. PORTER, OF LANVRENGE, MASS, ASSIGNOR TO THE S. SKYHITE DENTAL ll'IANUFAGTURING- COMPANY, OF PHILADELPHIA, PA.

A CONTINUOUS-BLAST APPARATUS.

SPECIFICATION forming part of Letters Patent No. 280,079, dated June 26, 1883. Application filed February Ii, 188;. (No moduli To (all whom it many canoe/n.

Be it'known that l, I)A.\'ID T. PORTER, of Lawrence, in the county of Essex and State oi- Massachusetts, have invented certain new and useful Improvements in Continuous-Blast Apparatus, more especially useful with blowpipes, of which the i'ollowingis a specification. 5

My invention relates to a blast apparatus, more especially useful with blow-pipes such as are used by jewelers and dentists in their (merations; and its object is to produce an au tomatie and continuous blast for the purposes 110w fulfilled in a defective manner by the common blow-pipe.

The subject-matter claimed is first i'ully described, and then particularly pointed out at the close of the specification. i

In the accompanying drawings, Figure 1 is a longitudinal Vertical. section through one form of my improved apparatus, and Fi 2 is a similar view through another form thereof.

The blast is produced-in my improved appttlftbUS by passing a current of water through a pipe, so as to create a partial vacuum and draw air through an inlet-opening, the air and water being carried to a separating-chamber, from which the water is discharged into a trap below, while the air by the accumulated pressure is forced out of an oulet-opening, either directly against the flame or thropgh a flexible tube carrying a suitable drafta'iozzle, whereby the continous jet or blast of air may be directed to the point desired.

An upright cylinder, A, is united at itslower end to a bowl, B, from which also extends an outlet-pipe, C, through which the-i 'ater escapes. means of the bowl B a water-trap is formed which enables the operation to be carried out as above described.

At the upper end of the cylinderrk there is an inlet-pipe, D, and an air-outlet pipe or discharge-orifice, E.- Extending into the upper end of the inlet-pipc D is a feed-pipe, 1), connected with any suitable water-supply. The feed-pipe maybe provided with a cock or valve to open or close its orifice to ,the passage of the water, as desired. This being a common contrivance, it has been deemed unnecessary to show it in the drawings. The tapered end of the feed-pipe 1) projects into the bore of the pipe I), the bore of which is contracted, as at (I, while above the lower discharge end of the teed-pipe J) an opening, at, is made in the pipe l) for the inlet or entrance of the air which is to constitute the blast. The pipe I) is provided in Fi II with a zigzag portion, so that the opening through said pipe is not a continu ous straight one, but is broken up by the zigzag formation above mentioned. \Vater flowing through the teed-pipe D has its Velocity increased by the tapered opening in said pipe, and as it is discharged into the pipe 1.) it is also concentrated by the throat or opening (I, of diminished diameter. The flow ot' the current of water creates a partial vacuum and sucks or draws in air through the inlet-opening d, before mentioned, and the water and air pass togethcrdown the pipe 1) until they reach the zigzag, where the water strikes or impinges upon the corners 01' shoulders formed thereby, and allows the water and air to partially separate, which separation is completed by the escape of the column. into the cylinder A, the water falling to the bowl B, to continim the formation of a water seal or trap, and escaping through the outlet-pipe C, while the air accumulates in the cylinder A above the column of the water seal or trap. The air'is thus driven out through the outlct-pipe E by the pressure in the cylinder, and constitutes a steady continuous blast, especially. useful as a substitute for the blow-pipe, as before meir tioned. The blast as it escapes from the out let-pipe E may be directed against the flame; or there may be connected to the said pipe E a rubber or other flexible tube, whereby the apparatus is given a wider range of capability and use, the outer or free end of the tube earrying a suitable drait-nozzle for directing the blast against the flame.

I have deemed it unnecessary to show a flexible-tube arrangement, as it is a common expedient in blast apparatus.

In Fig. 2, which shows a modified form of apparatus, the operation is the same, with the except-ion that there is no tapered opening in the feed-pipe D, while the preliminary sepa rating-chamber located at the lower end of the pipe l), instead of being formed between its ends, as shown by the zigzag inFig. 1.

Th e preliminary separating-chamber in Fig. 2 is formed by a box, F, screwed upon the pipe 1), and having an opening, f, in its side. The column, after passing through the contracted throator opening (1 in the pipe I), falls into the box and rises to flow out of the opening at its side, thus expanding the column and permitting of the preliminary separation of the air and water, which separation, as before described, is fully completed by the discharge into the cylinder A. The principal object of the contracted throat or opening in the pipe 1) is to form a barrier during the passage of the column or current'to the escape of the air up through said pipe, The air, therefore, is continuously and automatically fed in one direetion into the cylinder A, and from thence is driven through the outlet-pipe in a contin uous steady stream to do its work.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. ln a blast apparatus where the blast is produced by the flow of a current of water, a preliminary chamber for partially or wholly separating the air and water, substantially as described.

2. In a blast apparatus where the blast is produced by the flow of a current of water, a contraction in the pipe through which the current flows above a preliminary separatingchamber connected with said pipe, substan- \Vitnesses:

\V. Fisu Grim, GEORGE L. Vi /1r. 

